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Quantitative assessment of the surface crack density in thermal barrier coatings 被引量:5

Quantitative assessment of the surface crack density in thermal barrier coatings
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摘要 In this paper, a modified shear-lag model is developed to calculate the surface crack density in thermal barrier coatings(TBCs). The mechanical properties of TBCs are also measured to quantitatively assess their surface crack density. Acoustic emission(AE) and digital image correlation methods are applied to monitor the surface cracking in TBCs under tensile loading. The results show that the calculated surface crack density from the modified model is in agreement with that obtained from experiments. The surface cracking process of TBCs can be discriminated by their AE characteristics and strain evolution. Based on the correlation of energy released from cracking and its corresponding AE signals, a linear relationship is built up between the surface crack density and AE parameters, with the slope being dependent on the mechanical properties of TBCs. In this paper, a modified shear-lag model is developed to calculate the surface crack density in thermal barrier coatings(TBCs). The mechanical properties of TBCs are also measured to quantitatively assess their surface crack density. Acoustic emission(AE) and digital image correlation methods are applied to monitor the surface cracking in TBCs under tensile loading. The results show that the calculated surface crack density from the modified model is in agreement with that obtained from experiments. The surface cracking process of TBCs can be discriminated by their AE characteristics and strain evolution. Based on the correlation of energy released from cracking and its corresponding AE signals, a linear relationship is built up between the surface crack density and AE parameters, with the slope being dependent on the mechanical properties of TBCs.
出处 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2014年第2期167-174,共8页 力学学报(英文版)
基金 supported by the National Natural Science Foundation of China(11002122,51172192,11272275,and 10828205) the Natural Science Foundation of Hunan Province(11JJ4003) the Key Project of Scientific Research Conditions in Hunan Province(2012TT2040) The specimens were provided by the AVIC Shenyang Liming Aero-Engine(GROUP)Corporation Ltd
关键词 Thermal barrier coatings Acoustic emission Surface crack density Quantitative assessment Thermal barrier coatings Acoustic emission Surface crack density Quantitative assessment
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